core: move to CProcess from hyprutils

this enhances security, avoids calling the shell when invoking the picker

CMakeLists.txt

@@ -64,7 +64,7 @@ pkg_check_modules(
   libdrm
   gbm
   hyprlang>=0.2.0
-  hyprutils
+  hyprutils>=0.2.6
   hyprwayland-scanner>=0.4.2)
 
 # check whether we can find sdbus-c++ through pkg-config

hyprland-share-picker/CMakeLists.txt

@@ -17,6 +17,13 @@ set(CMAKE_CXX_STANDARD_REQUIRED ON)
 find_package(QT NAMES Qt6 REQUIRED COMPONENTS Widgets)
 find_package(Qt6 REQUIRED COMPONENTS Widgets)
 
+find_package(PkgConfig REQUIRED)
+pkg_check_modules(
+  deps
+  REQUIRED
+  IMPORTED_TARGET
+  hyprutils>=0.2.6)
+
 set(PROJECT_SOURCES main.cpp mainpicker.cpp mainpicker.h mainpicker.ui
                     elidedbutton.h elidedbutton.cpp)
 
@@ -38,7 +45,7 @@ else()
 endif()
 
 target_link_libraries(hyprland-share-picker
-                      PRIVATE Qt${QT_VERSION_MAJOR}::Widgets)
+                      PRIVATE Qt${QT_VERSION_MAJOR}::Widgets PkgConfig::deps)
 
 set_target_properties(
   hyprland-share-picker

hyprland-share-picker/main.cpp

@@ -15,21 +15,20 @@
 #include <stdexcept>
 #include <string>
 #include <vector>
+#include <hyprutils/os/Process.hpp>
+using namespace Hyprutils::OS;
 
 #include "mainpicker.h"
 #include "elidedbutton.h"
 
 std::string execAndGet(const char* cmd) {
-    std::array<char, 128>                    buffer;
-    std::string                              result;
-    std::unique_ptr<FILE, decltype(&pclose)> pipe(popen(cmd, "r"), pclose);
-    if (!pipe) {
-        throw std::runtime_error("popen() failed!");
-    }
-    while (fgets(buffer.data(), buffer.size(), pipe.get()) != nullptr) {
-        result += buffer.data();
-    }
-    return result;
+    std::string command = cmd + std::string{" 2>&1"};
+    CProcess    proc("/bin/sh", {"-c", cmd});
+
+    if (!proc.runSync())
+        return "error";
+
+    return proc.stdOut();
 }
 
 QApplication* pickerPtr     = nullptr;

src/helpers/MiscFunctions.cpp

@@ -8,20 +8,17 @@
 #include <string>
 #include <algorithm>
 
-std::string execAndGet(const char* cmd) {
-    Debug::log(LOG, "execAndGet: {}", cmd);
+#include <hyprutils/os/Process.hpp>
+using namespace Hyprutils::OS;
 
-    std::array<char, 128>                          buffer;
-    std::string                                    result;
-    const std::unique_ptr<FILE, decltype(&pclose)> pipe(popen(cmd, "r"), pclose);
-    if (!pipe) {
-        Debug::log(ERR, "execAndGet: failed in pipe");
-        return "";
-    }
-    while (fgets(buffer.data(), buffer.size(), pipe.get()) != nullptr) {
-        result += buffer.data();
-    }
-    return result;
+std::string execAndGet(const char* cmd) {
+    std::string command = cmd + std::string{" 2>&1"};
+    CProcess    proc("/bin/sh", {"-c", cmd});
+
+    if (!proc.runSync())
+        return "error";
+
+    return proc.stdOut();
 }
 
 void addHyprlandNotification(const std::string& icon, float timeMs, const std::string& color, const std::string& message) {

src/shared/ScreencopyShared.cpp

@@ -9,10 +9,15 @@
 #include <sys/stat.h>
 #include <fcntl.h>
 
+#include <hyprutils/os/Process.hpp>
+using namespace Hyprutils::OS;
+
 std::string sanitizeNameForWindowList(const std::string& name) {
     std::string result = name;
     std::replace(result.begin(), result.end(), '\'', ' ');
     std::replace(result.begin(), result.end(), '\"', ' ');
+    std::replace(result.begin(), result.end(), '$', ' ');
+    std::replace(result.begin(), result.end(), '`', ' ');
     for (size_t i = 1; i < result.size(); ++i) {
         if (result[i - 1] == '>' && result[i] == ']')
             result[i] = ' ';
@@ -43,19 +48,28 @@ SSelectionData promptForScreencopySelection() {
     static auto* const* PALLOWTOKENBYDEFAULT =
         (Hyprlang::INT* const*)g_pPortalManager->m_sConfig.config->getConfigValuePtr("screencopy:allow_token_by_default")->getDataStaticPtr();
 
-    // DANGEROUS: we are sending a list of app IDs and titles via env. Make sure it's in 'singlequotes' to avoid something like $(rm -rf /)
-    // TODO: this is dumb, use a pipe or something.
-    std::string cmd =
-        std::format("WAYLAND_DISPLAY='{}' QT_QPA_PLATFORM='wayland' XCURSOR_SIZE='{}' HYPRLAND_INSTANCE_SIGNATURE='{}' XDPH_WINDOW_SHARING_LIST='{}' hyprland-share-picker{} 2>&1",
-                    WAYLAND_DISPLAY ? WAYLAND_DISPLAY : "", XCURSOR_SIZE ? XCURSOR_SIZE : "24", HYPRLAND_INSTANCE_SIGNATURE ? HYPRLAND_INSTANCE_SIGNATURE : "0", buildWindowList(),
-                    (**PALLOWTOKENBYDEFAULT ? " --allow-token" : ""));
+    std::vector<std::string> args;
+    if (**PALLOWTOKENBYDEFAULT)
+        args.emplace_back("--allow-token");
 
-    const auto RETVAL = execAndGet(cmd.c_str());
+    CProcess proc("hyprland-share-picker", args);
+    proc.addEnv("WAYLAND_DISPLAY", WAYLAND_DISPLAY ? WAYLAND_DISPLAY : "");
+    proc.addEnv("QT_QPA_PLATFORM", "wayland");
+    proc.addEnv("XCURSOR_SIZE", XCURSOR_SIZE ? XCURSOR_SIZE : "24");
+    proc.addEnv("HYPRLAND_INSTANCE_SIGNATURE", HYPRLAND_INSTANCE_SIGNATURE ? HYPRLAND_INSTANCE_SIGNATURE : "0");
+    proc.addEnv("XDPH_WINDOW_SHARING_LIST", buildWindowList()); // buildWindowList will sanitize any shell stuff in case the picker (qt) does something funky? It shouldn't.
+
+    if (!proc.runSync())
+        return data;
+
+    const auto RETVAL    = proc.stdOut();
+    const auto RETVALERR = proc.stdErr();
 
     if (!RETVAL.contains("[SELECTION]")) {
         // failed
+        constexpr const char* QPA_ERR = "qt.qpa.plugin: Could not find the Qt platform plugin";
 
-        if (RETVAL.contains("qt.qpa.plugin: Could not find the Qt platform plugin")) {
+        if (RETVAL.contains(QPA_ERR) || RETVALERR.contains(QPA_ERR)) {
             // prompt the user to install qt5-wayland and qt6-wayland
             addHyprlandNotification("3", 7000, "0", "[xdph] Could not open the picker: qt5-wayland or qt6-wayland doesn't seem to be installed.");
         }
@@ -71,11 +85,10 @@ SSelectionData promptForScreencopySelection() {
     const auto SEL   = SELECTION.substr(SELECTION.find_first_of('/') + 1);
 
     for (auto& flag : FLAGS) {
-        if (flag == 'r') {
+        if (flag == 'r')
             data.allowToken = true;
-        } else {
+        else
             Debug::log(LOG, "[screencopy] unknown flag from share-picker: {}", flag);
-        }
     }
 
     if (SEL.find("screen:") == 0) {